package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
public class DishServiceImpl implements DishService {

    //注入dishMapper
    @Autowired
    private DishMapper dishMapper;

    //注入dishFlavorMapper
    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    //注入SetmealDishMapper
    @Autowired
    private SetmealDishMapper setmealDishMapper;

    //注入SetmealMapper
    @Autowired
    private SetmealMapper setmealMapper;


    /**
     * 新增菜品
     * @param dishDTO
     */
    @Override
    @Transactional  //开启事务
    public void saveWithFlavor(DishDTO dishDTO) {
        //new一个菜品对象 并把DTO对象中的属性赋值给菜品对象
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //向菜品插入一条数据
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        //判断用户是否传递了口味数据
        if(flavors != null && flavors.size() > 0){
        //遍历flavors集合，为每个DishFlavor对象设置dishId属性
            flavors.forEach(dishFlavor -> {
            dishFlavor.setDishId(dishId);
            });
            //向菜品中添加n个口味数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 根据条件分页查询菜品信息
     *
     * @param dishPageQueryDTO 包含分页查询条件的DTO对象，包括页码和页面大小等信息
     * @return 返回一个PageResult对象，其中包含总记录数和查询结果列表
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始分页查询
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());

        //执行分页查询，获取分页对象
        Page<DishVO> page =dishMapper.pageQuery(dishPageQueryDTO);

        //返回分页对象
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional //开启事务
    public void deleteBatch(List<Long> ids) {
        //1.判断当前菜品是否在起售状态
        //先遍历菜品id集合，获取每一个菜品id 然后在判断是否为启售状态
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
                //2.如果菜品正在起售中，则不能删除，抛出业务异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //2.判断当前菜品是否关联了套餐，如果关联了套餐，则不能删除，抛出业务异常
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);

        if(setmealIds != null && setmealIds.size() > 0){
            //当前菜品关联了套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //3.删除菜品表中的数据
        for (Long id : ids) {
            dishMapper.deleteById(id);

            //删除菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }


    /**
     * 根据id查询菜品
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        //将查询到的数据封装到DishVO中
        //创建一个DishVO对象
        DishVO dishVO=new DishVO();

        //将dish中的属性拷贝到dishVO中
        BeanUtils.copyProperties(dish,dishVO);

        //增加根据菜品id查询到的口味数据
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //将DTO中的属性拷贝到Dish对象中
        //新建一个Dish对象
        Dish dish=new Dish();

        //将dishDTO中的属性拷贝到dish中
        BeanUtils.copyProperties(dishDTO,dish);

        //修改菜品的基本信息
        dishMapper.update(dish);


        //删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());


        //重新插入新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();  //获取插入的口味列表数据
        //判断用户是否传递了口味数据
        if(flavors != null && flavors.size() >0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表中批量插入数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }


    /**
     * 根据分类id查询菜品
     * @param categoryId
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();

        //调用dishMapper的list方法查询数据
        return dishMapper.list(dish);
    }

    /**
     * 菜品起售停售
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
}
